Pin Assignment - Harman Kardon HK 990/230 Service Manual

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FEATURES
§ Automatically restarts a microprocessor after
power failure
§ Monitors pushbutton for external override
§ Maintains reset for 150 ms after V
to an in-tolerance condition
§ Reduces need for discrete components
§ Precision temperature-compensated voltage
reference and voltage sensor
§ Accurate 5%, 10% or 20% power monitoring
§ Low-cost TO-92 or space saving surface
mount SOT-23 packages available
§ Efficient open-drain output with internal
5.5 kW pull-up resistor
§ Operating temperature -40°C to +85°C
DESCRIPTION
The DS1818 EconoReset uses a precision temperature-compensated reference and comparator circuit to
monitor the status of the power supply (V
power-fail signal is generated which forces reset to the active state. When V
condition, the reset signal is kept in the active state for approximately 150 ms to allow the power supply
and processor to stabilize.
The DS1818 also monitors a pushbutton on the reset output. If the reset line is pulled low, a reset is
generated upon release and the DS1818 output will be held in reset output low for typically 150 ms.
3.3V EconoReset with Pushbutton

PIN ASSIGNMENT

returns
CC
BOTTOM VIEW
TO-92 PACKAGE
Drawings Section
PIN DESCRIPTION
TO-92
1
2
3
SOT-23
1
2
3
). When an out-of-tolerance condition is detected, an internal
CC
44
3
DALLAS
DS1818
Econo
Reset
1
TOP VIEW
SOT-23 PACKAGE
See Mech.
Drawings Section
On Website
1 2 3
1 2 3
See Mech.
On Website
Active Low Reset Output
RST
V Power Supply
CC
GND Ground
Active Low Reset Output
RST
V Power Supply
CC
GND Ground
returns to an in-tolerance
CC
DS1818
2
041002